Quelle Lead.vdmrt Sprache: VDM

\section{Lead class}

The Lead models a Pacemaker lead that read and write pulse values from
and to the heart. Each lead its attached to a specific chamber and this
is captured using the instance variable chamber.

\begin{vdm_al}
class Lead is subclass of GLOBAL

instance variables

private chamber : Chamber;
private scheduledPulse : [(Time * Pulse)];

operations

public
Lead: Chamber ==> Lead
Lead(chm) ==
   (
    chamber := chm;
    scheduledPulse := nil
   );
\end{vdm_al}

This is an auxiliar function that inspect the chamber where this lead is
attached to.

\begin{vdm_al}

public
getChamber: () ==> Chamber
getChamber () == return chamber;
\end{vdm_al}

Whenever theres an electrical pulse in that chamber the environment will
call the following stimulate operation.

\begin{vdm_al}

public
stimulate : Sense ==> ()
stimulate (s) == Pacemaker`heartController.sensorNotify(s,chamber);

\end{vdm_al}

\begin{vdm_al}
public
isFinished : () ==> ()
isFinished () == skip;

\end{vdm_al}

The following operation discharges a pulse to the heart.

\begin{vdm_al}
public
addLeadPace : Pulse * Time ==> ()
addLeadPace (p,t) ==
   if t <= time
   then dischargePulse(p,chamber)
   else (scheduledPulse := mk_(t,p);
         return);
\end{vdm_al}

\begin{vdm_al}
private
dischargePulse : Pulse * Chamber ==> ()
dischargePulse (p,c) ==
    duration(4)
    World`env.handleEvent(p,c,time);
\end{vdm_al}

\begin{vdm_al}
private
followPlan : () ==> ()
followPlan () ==
    (
     dcl curTime : Time := time;
     if scheduledPulse <> nil
     then if(curTime >= scheduledPulse.#1)
          then (dischargePulse(scheduledPulse.#2,chamber);
                scheduledPulse := nil);

   );


\end{vdm_al}

\begin{vdm_al}
thread
  periodic (50E6,0,49,0) (followPlan)

\end{vdm_al}

\begin{vdm_al}
sync

mutex(addLeadPace);
mutex(dischargePulse);
mutex(followPlan);
per isFinished =>  scheduledPulse = nil;

end Lead
\end{vdm_al}

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